Building-block-mold core.



No. 837,662. PATENTED DEC. 4, 1906.

- F. A. HORST. BUILDING BLOCK MOLD GORE.

APPLIOATION FILED AUG. 20, 1906.

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UNITED srArns QPATENT OFFICE.

FRANK A. BORST, OF SOUTH BEND, INDIANA, ASSIGNOR TO IDEAL CONCRETEMACHINERY COMPANY, OF SOUTH BEND, INDIANA, A

CORPORATION OF INDIANA.

Specification of Letters Patent.

Patented Dec. 4, 1906.

Application filed ugust 20, 1906. $eria1N0- 331,249-

T at whom it may concern:

Be it known that I, FRANK A. BORST, a citizen of the United States, anda resident of South Bend, in the county of St. Joseph and State ofIndiana, have invented a new and Improved Building-Block-Mold Core, ofwhich the following is a specification.

My invention relates to molds for the forming of concretebuilding-blocks, particularly blocks that may be employed for theforming of chimneys, fines, and corners; and the object of myimprovement is to provide cores for block-molding machines that shall bestrong and easily withdrawn and that can be cheaply constructed.

My invention consists of members hinged together and means to hold themembers at a predetermined angle to each other.

It consists more particularly in three of such members hinged together,a post formed on the middle member, and a brace pivoted on said post andadapted to engage the two outer members to hold them in position.

In the drawings, Figure 1 is a plan of a block-molding machine with acollapsible core, such as shown in Fig. 7. Fig. 2 is a verticalcross-section on the line A A of Fig. 1. Fig. 3 is a front view of theblock-molding machine in its discharging position. Figs. 4 and 5 areviews of blocks molded on this machine with the aid of the collapsiblecores shown in Figs. 6 and 7, respectively.

Similar reference characters refer to like parts throughout the severalviews.

In the drawings, 1 represents the legs, and 2 the top of the frame, of aconcrete-block machine. To the rear of the frame is secured the backplate 3 of the mold proper. The front plate 4 is hinged to the frame at5 and when swung forward to discharging position rests on the arm 6,extending forward from the frame. This front plate has arms or horns 7formed on it, which arms are adapted when the mold is open to supportthe end doors or plates 8, which are hinged to the front plate 4 at 9. Afaceplate 10, normally resting on the frame, is mounted on the pins 11,secured to the front plate, and a pallet 12 rests against the frontplate and on the face-plate. The mold is locked together handles 15v areraised and the front plate by means of the cams 13, pivoted on the lugs14 on the end plates, which cams engage back of the back plate, as shownin Fig. 1.

When the block has been molded, the camswung down to horizontalposition, as shown in Fig. 3, together with the pallet 12. The bottomplate is carried up to vertical position by means of the pins 11 and theend plates 8 permitted to drop down to the position shown in Fig. 3. Thepallet, and with it the molded block, is now carried away and a newpallet substituted and the mold again closed.

For the construction of chimneys and fines it is often desirable to moldblocks of the form shown in Figs. 4 and 5. To do this, cores, such asshown in Figs. 6 and 7, may be employed. The core shown in Fig. 6 isformed of the leaves or members 16 and 17, hinged together on the rod18. A post 19, formed on the member 16, carries a pivoted brace or bar20, which contacts with the outer edge of the leaf 17, and thus holds itat the proper angle. The inner edges of these members cont act in such amanner as to prevent movement beyond an angle of about ninety degrees.

The core shown in Fig. 7 has the three members 22, 23, and 24. The brace26 on the post on the middle member contacts with the free edges of theouter leaves to prevent them from moving inward, the beveled end of thebrace having a strong wedging action on the leaves 23 and 24.

When it is desired to mold ablock30, such as shown in Fig. 4, the moldis filled and leveled to the proper depth. The core of Fig. 6 is thenplaced on the concrete with the edge of the leaf 16 against an end plate8. The member 17 is then swung out and locked by means of the brace 20,when the space between this member 17 and its adjacent door is rammedfull of concrete to form the part 31. The brace 20 is then swung out ofthe way, the member 17 swung in, and the core is lifted out of the mold.The blocks 32, Fig. 5, are molded by employing the core of Fig. 7 in amanner similar to that just described.

Having now explained my improvements, what I claim as my invention, anddesire to secure by Letters Patent, is-

1. A core for concrete block machines comprising members hinged togetherand adapted to have their adjacent ends contact when the members form aright angle, a post attached to one of said members, and a brace pivotedon said post and adapted to engage the free end of another member andlock the same in position.

2. A core for concrete block machines comprising three members, hingedtogether and adapted to have adjacent ends contact when the adjacentmembers form substan tially right angles, a post on the middle member,and a brace pivoted on said post and adapted to engage the free ends ofthe other members to lock the same in position.

3. A core for concrete block machines comprising a main member, a leafhinged thereto, and a brace to hold said leaf at a predetermined angleto the main member.

In testimony whereof I have signed my name in the presence of twosubscribing witnesses.

FRANK A. B'ORST. Witnesses G. B. HoPKINs, G. A. AYRAULT.

